Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details)

v3.20.4
Derivative Instruments and Hedging Activities (Schedule of Outstanding Oil and Natural Gas Derivative Contracts) (Details) - Forecast - Not Designated as Hedging Instrument
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
bbl
Jun. 30, 2021
bbl
Sep. 30, 2021
bbl
Dec. 31, 2021
MMBTU
$ / MMBTU
$ / bbl
bbl
Commodity - Oil | Swap contracts        
Derivative [Line Items]        
Total volume (Bbls) | bbl       1,827,000
Weighted average price (in dollars per share)       43.54
Commodity - Oil | Short        
Derivative [Line Items]        
Total volume (Bbls) | bbl       4,825,300
Weighted average price (in dollars per share)       63.62
Commodity - Oil | Short | Swap contracts | Call option        
Derivative [Line Items]        
Total volume (Bbls) | bbl 455,000 460,000 460,000 1,375,000
Weighted average price (in dollars per share)       49.01
Commodity - Oil | Collar contracts (Brent ICE)        
Derivative [Line Items]        
Total volume (Bbls) | bbl       730,000
Commodity - Oil | Collar contracts (Brent ICE) | Short | Call option        
Derivative [Line Items]        
Weighted average price (in dollars per share) | $ / bbl       50.00
Commodity - Oil | Collar contracts (Brent ICE) | Long | Put option        
Derivative [Line Items]        
Weighted average price (in dollars per share) | $ / bbl       45.00
Commodity - Oil | Collar contracts (WTI)        
Derivative [Line Items]        
Total volume (Bbls) | bbl       10,282,775
Commodity - Oil | Collar contracts (WTI) | Short | Call option        
Derivative [Line Items]        
Weighted average price (in dollars per share) | $ / bbl       46.69
Commodity - Oil | Collar contracts (WTI) | Long | Put option        
Derivative [Line Items]        
Weighted average price (in dollars per share) | $ / bbl       39.28
Commodity - Oil | Oil contracts (Brent ICE) | Swap contracts        
Derivative [Line Items]        
Total volume (Bbls) | bbl       848,300
Weighted average price (in dollars per share) | $ / bbl       37.36
Commodity - Oil | Oil contracts (Midland basis differential)        
Derivative [Line Items]        
Total volume (Bbls) | bbl       3,022,900
Weighted average price (in dollars per share) | $ / bbl       (0.26)
Commodity - Oil | Oil contracts (Argus Houston MEH swaps) | Swap contracts        
Derivative [Line Items]        
Total volume (Bbls) | bbl       450,000
Weighted average price (in dollars per share)       46.50
Commodity - Oil | Collar contracts (Argus Houston MEH)        
Derivative [Line Items]        
Total volume (Bbls) | bbl       409,500
Commodity - Oil | Collar contracts (Argus Houston MEH) | Short | Call option        
Derivative [Line Items]        
Weighted average price (in dollars per share) | $ / bbl       47.00
Commodity - Oil | Collar contracts (Argus Houston MEH) | Long | Put option        
Derivative [Line Items]        
Weighted average price (in dollars per share) | $ / bbl       41.00
Commodity - Natural gas | Swap contracts        
Derivative [Line Items]        
Weighted average price (in dollars per share)       2.60
Total volume (MMBtu) | MMBTU       11,123,000
Commodity - Natural gas | Swap contracts | Call option        
Derivative [Line Items]        
Weighted average price (in dollars per share)       3.09
Total volume (MMBtu) | MMBTU       7,300,000
Commodity - Natural gas | Collar contracts (three-way collars)        
Derivative [Line Items]        
Total volume (MMBtu) | MMBTU       1,350,000
Commodity - Natural gas | Collar contracts (three-way collars) | Short | Call option        
Derivative [Line Items]        
Weighted average price (in dollars per share)       2.70
Commodity - Natural gas | Collar contracts (three-way collars) | Short | Put option        
Derivative [Line Items]        
Weighted average price (in dollars per share)       2.00
Commodity - Natural gas | Collar contracts (three-way collars) | Long        
Derivative [Line Items]        
Weighted average price (in dollars per share)       2.42
Commodity - Natural gas | Collar contracts (two-way collars)        
Derivative [Line Items]        
Total volume (MMBtu) | MMBTU       9,550,000
Commodity - Natural gas | Collar contracts (two-way collars) | Short | Call option        
Derivative [Line Items]        
Weighted average price (in dollars per share)       3.04
Commodity - Natural gas | Collar contracts (two-way collars) | Long | Put option        
Derivative [Line Items]        
Weighted average price (in dollars per share)       2.59
Commodity - Natural gas | Waha basis differential | Swap contracts        
Derivative [Line Items]        
Total volume (MMBtu) | MMBTU       16,425,000
Weighted average price (in dollars per share)       (0.42)
Natural gas liquids | NGL contracts (OPIS Mont Belvieu Purity Ethane) | Swap contracts        
Derivative [Line Items]        
Total volume (Bbls) | bbl       1,825,000
Weighted average price (in dollars per share)       7.62